I guess that's a personal choice or even a personality variation then. Personally I sort of agree, I too would want an SUV even though I will almost never take it off a paved road and I don't have a big family. However, that choice is influenced by other aspects of the car (comfort and trunk size primarily). If an SUV was no more comfortable or had no larger trunk than a sedan, I would probably not buy an SUV. Similarly though, the other than the touch-screen and detachability aspect of the Surface line, it's not much different than a Macbook.
Also cars are sort of an exception, that aspect of car-buying has been studied before, and it seems the conclusion was that cars are unique in this regard. I think the majority of the population doesn't view computer buying that same way.
People tend to pick cars that will cover 99% of their use cases, even though they can save a ton of money if they were to buy a car that covered just 90% of their use cases. But people don't buy anything else like this: For example, people don't buy giant industrial-size dishwashers because they plan on hosting a big thanksgiving dinner every other year, where the rest of the time it's a small family of four using it. There are plenty of other examples of this - people tend to buy only what they need the majority of the time. The biggest exception is cars though.
I'm not sure if people buy laptops more like cars, or more like everything else. I bet it's the latter.